package com.freen.fadmin.module.filter;

import com.freen.fadmin.entity.sysuser.SysUser;
import com.freen.fadmin.util.JwtSysuserTokenUtils;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;

public class JwtAuthorizationFilter extends BasicAuthenticationFilter {
    public JwtAuthorizationFilter(AuthenticationManager authenticationManager){
        super(authenticationManager);
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        String tokenHeader = request.getHeader(JwtSysuserTokenUtils.TOKEN_HEADER);
        // 如果请求头中没有 Authorization 信息则直接放行了
        if (tokenHeader == null || !tokenHeader.startsWith(JwtSysuserTokenUtils.TOKEN_PREFIX)){
            chain.doFilter(request,response);
            return;
        }
        // 如果请求头中有token，则进行解析，并且设置认证信息
        SecurityContextHolder.getContext().setAuthentication(getAuthentication(tokenHeader));
        super.doFilterInternal(request, response, chain);
        Object principal = SecurityContextHolder.getContext().getAuthentication().getPrincipal();
//        System.out.println("header"+SecurityContextHolder.getContext().getAuthentication().getPrincipal().toString());
//        System.out.println("header"+SecurityContextHolder.getContext().getAuthentication().getAuthorities().toString());
    }
    // 这里从token中获取用户信息并新建一个token
    private UsernamePasswordAuthenticationToken getAuthentication(String tokenHeader){
        String token = tokenHeader.replace(JwtSysuserTokenUtils.TOKEN_PREFIX,"");
        String username = JwtSysuserTokenUtils.getUsername(token);
        String role = JwtSysuserTokenUtils.getUserRole(token);
//        System.out.println("开始解析");
//        System.out.println(token);
//        System.out.println(role);
//        System.out.println(username);
//        System.out.println("解析结束");
        if (username != null){
            return new UsernamePasswordAuthenticationToken(username,null, Collections.singleton(new SimpleGrantedAuthority(role)));
        }
        return null;
    }
}
